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2. ICD-10 Codes
3. Chapter - H00-H59
4. Section - H40-H42
5. Category - H40
6. H40.21

H40.21 - Acute angle-closure glaucoma

• Applicable to Acute angle-closure glaucoma
• The 2025 edition of ICD10-CM H40.21 became effective on October 1, 2024.
• This is the American ICD10-CM version of H40.21 - other international versions of ICD10 H40.21 may differ.
• H40.21 is a Non-Billable / Non-Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• H40.21 Code should not be used for billing or reimbursement purposes as there are multiple ICD-10 CM codes below it that contain a greater level of detail.

• Acute angle-closure glaucoma attack
• Acute angle-closure glaucoma crisis

The following codes above H40.21 contain annotation back-references that may be applicable to H40.21:

• Chapter: H00-H59 - Diseases of the eye and adnexa
• Section: H40-H42 - Glaucoma
• Category: H40 - Glaucoma

Browse other similar CM codes:

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.